Question

Why does the shoot of plant bend towards lights,when it is kept inside cardboard box with a small hole?

Answer 1

When plant is kept inside a cardboard box with a small hole. light enters into cardboard through hole .
 Plants also move toward the light.
Seeds push little leaves up from the ground into the light. A house plant in a dark room will grow toward the light. This movement in response to light is called phototropism.
When a plant moves toward the light, it’s called positive tropism. When a plant moves away from light, it’s called negative tropism.
They do so with the help of chemicals called auxins.
Think of auxins as an elastic band for cells.
They help cells get longer and move. Sunlight reduces auxin, so the areas of the plant that are exposed to sunlight will have less auxin.
The areas on the dark side of the plant will have more auxin. That means that they will have long, stretchy cells.
 This allows the plant to move toward the light.

Answer 2

Answer:

Explanation:

auxin is one of the plant hormones which helps the plants bend. when the plant is kept in a box with a small hole light where the light hits the plants the auxin in that part moves to the opposite side of the plants hence the plant bends towards light. bending of light towards light is called phototropism.